I mentioned quite a few things in post number 8 but definitely a low pressure switch on your fuel line. That way if your fuel pressure drops you're not running too much nitrous and not enough fuel which is very bad. Also I use a window switch which lets me set the perimeters of RPMs that I want the nitrous to work at. Like I have mine set to go off between 3500 RPMs and 5600... Both switches have to be in play for the ground to work on my relay that opens up the nitrous system. And also on the power to the nitro system I have a full throttle switch and a activation button and also that sends an electrical signal to the timing retard... some people just turn a distributor back two degrees for every 50 horsepower of nitrous but I prefer to just pull that timing out when it's needed instead of all of the time...
